Counting Atoms
What elements are present and how many atoms for each in the formula: LiOH
The elements present are Lithium (Li) with 1 atom, Oxygen (O) with 1 atom, and Hydrogen (H) with 1 atom.
What is the difference between an element and a compound?
An element is found on the periodic table and is a pure substance, a compound is two or more different elements chemically combined
What are reactants and where can you find them in a chemical equation?
They are the elements that react to form a product and they are found on the left side of the chemical equation
What is the big number in front of a chemical formula that gets multiplied by all the atoms AND what does it show for the formula?
coefficient and it shows the number of molecules
What is the density of water AND what would happen if you put a liquid with a density of 0.86 g/mL in water?
The density of water is 1 g/mL and if you put a liquid with a density of 0.86 g/mL in water, it would float above it
What elements are present AND how many atoms for each element are present in the formula: (NH₄)₂SO₄
The elements present are Nitrogen (N) with 2 atoms, Hydrogen (H) with 8 atoms, Sulfur (S) with 1, and Oxygen (O) with 4 atoms
Is NaCl an element or a compound AND why?
NaCl is a compound because it has more than one type of element chemically bonded together
What happens to atoms during a chemical reaction AND what happens to the mass following the Law of Conservation of Mass?
Atoms are rearranged into new substances/ compounds, not created nor destroyed, and the mass remains the same/ constant between the reactants and products
What does the Law of Conservation of Mass state?
Matter cannot be created nor destroyed, only rearranged
List THREE properties of nonmetals
brittle, poor conductors, good insulators, dull
What elements are present AND how many atoms of each element are in the formula for: Pb(CH₃COO)₄
The elements present are Lead (Pb) with 1 atom, Carbon (C) with 8 atoms, Hydrogen (H) with 12 atoms, and Oxygen (O) with 8 atoms
Is N2 an element or compound AND why?
N2 is an element because it is the same element with two of the same atoms
Find the missing mass, in grams:
Ca(OH)2 + 2HCl → CaCl2 + 2H2O
148.2g 145.8g ? 72.1g
The missing mass of CaCl2 is 221.9g
What is the process called when reactants undergo a chemical change into products?
Chemical Equation
What are 6 signs that a chemical change has occurred?
Color change, gas production, light production, temperature change, precipitate, rotting, and burning
What elements are present AND how many atoms for each element are present AND what is the total amount of atoms for the entire chemical formula: 5KMnO4
The elements present are Potassium (K) with 5 atoms, Manganese (Mn) with 5 atoms, and Oxygen (O) with 20 atoms
The total number of atoms present is 30
What are the compounds in the following equation AND what are elements in the following equation:
6CO2+6H2O→C6H12O6+6O2
The compounds are 6CO2, 6H2O, and C6H12O6
The elements are 6O2
Count the total atoms for the reactants, products, THEN find the missing mass:
C5H12 + 8O2 → 4H2O + 5CO2
335.1g 195.6g ? 476.8g
What is the arrow symbol called and what does it mean?
Yield and it separates the reactants from the products
What are 2 properties of Rare Earth Elements and what are they used for?
Rare Earth Elements have distinct magnetism, fluorescence, and are soft AND they are used in modern technology
What elements are present AND how many atoms for each element are present AND what is the total amount of atoms for the entire chemical formula: 9Fe(C₂H₃O₂)₃
The elements present are Iron (Fe) with 9 atoms, Carbon (C) with 54 atoms, Hydrogen (H) with 81 atoms, and Oxygen (O) with 54 atoms
The total number of atoms present is 198
What is the name for the following elements, without using a periodic table: O, C, H, K, Cl, N
The names for the following elements are Oxygen, Carbon, Hydrogen, Potassium, Chlorine, and Nitrogen
Determine the elements on the reactants and products side, the amount of atoms for each element, AND if the equation follows the Law of Conservation of Mass and WHY? :
3Ca(NO₃)₂ + 2Al₂(SO₄)₃ → Al(NO₃)₃ + 3CaSO₄.
Reactants have Calcium (Ca) with 3 atoms, Nitrogen (N) with 6 atoms, Oxygen (O) with 42 atoms, Aluminum (Al) with 4 atoms, and Sulfur (S) with 6 atoms.
Products have Calcium (Ca) with 3 atoms, Nitrogen (N) with 3 atoms, Oxygen (O) with 21 atoms, Aluminum (Al) with 1 atoms, and Sulfur (S) with 3 atoms.
This equation is not balanced because the amount of atoms on the reactants side and the products side are not equal
What is the difference between a element vs a compound
an element is a pure substance with one capital letter (or a capital and a lowercase) and a compound is multiple elements chemically combined.
What are THREE differences between metal and non-metals AND where can you find each of them on the periodic table?
metals have luster, nonmetals are dull
metals are malleable and ductile, nonmetals are brittle
metals are good conductors, nonmetals are poor conductors/ good insulators
metals are gray-silver, nonmetals are colorful
AND
You can find metals on the left side of the staircase and nonmetals on the right side of the staircase